Pi (ℼ) - the value that is approximately 3.14 and is the ratio of the circumference and diameter of any circle. It is used in calculating the area and circumference of any circle., Radius - the distance from the center of a circle to the outside. It is also half of the diameter., Volume - the measurement of how many cubic units can fit inside a 3 dimensional shape., Cone - a 3 dimensional shape that tapers to a point from a circular base.,

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